<script>   
   const student = {   
     name: '小雅',   
     age: 19,   
     showInfo : function () {   
    setTimeout(function () {   
    console.log('我叫' + this.name + '我今年' + this.age + '岁');   
    }, 1000);   
      }   
     }   
     // 1秒后控制台输出：我叫我今年undefined岁   
     student.showInfo();    
   </script>